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the sides about the equal angles EBC, LGH are proportional;
therefore
the triangle EBC is equiangular with the triangle LGH, [V1.6]
so that
the triangle EBC is similar to the triangle LGH. [V1.4 and VI.Def.1]
For the same reason
the triangle ECD is also similar to the triangle LHK.
Therefore
the similar polygons ABCDE, FGHKL have been divided into similar triangles, and into triangles equal in multitued.
